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The geocentric model could not explain which of the following observations made by early astronomers? Select the two correct answers.(1 point)

Responses

The stars appeared to move.
The stars appeared to move.

The planets had epicycles.
The planets had epicycles.

Mercury and Venus changed in appearance throughout the year.
Mercury and Venus changed in appearance throughout the year.

Mars and Jupiter appeared to move backwards for some period of time.

1 answer

The two observations that the geocentric model could not explain are:

  1. Mercury and Venus changed in appearance throughout the year.
  2. Mars and Jupiter appeared to move backwards for some period of time.

The geocentric model struggled with explaining the apparent retrograde motion of Mars and Jupiter, as well as the varying appearance of Mercury and Venus, which are inner planets that can show phases similar to the Moon.